VirusTotal result 21/42 wtf ?

Hi guys, I have a strange situation here and i'm a little bit confused..
Somebody on this forum pmed me for the FriendAdderElite patch and there is also a request for it so I thought to post it here for everybody but first I thought i make a scan with virustotal and the result was 21/42. The arhive has 3 files installer+patch+ putterplace.nfo .
When I installed this in my computer long time ago my antiv didn't alert me of anything. Now I got scared and I have scanned my comp with kaspersky, spybot,avira,panda, bitdefender and a few more and the trojans were found all in the patch file which was in the root folder.
After I deleted the patch file from there I have made another scan with some of these antiv programs and everything seems to be ok.
Now my question is ...
Should I worry and start formating my drives and reinstall windows or it is possible that all those results to be false ?
What do you guys think ?

Later Edit:
For the last 3 hours i have scanned my pc with Malwarebytes, superantispyware, TrojanRemovalTool,Ad-Aware, SpyBot S&D and some free versions of antivirus programs that VirusTotal uses and none of them gave me positive results other than some cookies.
I guess the problem was with the patch file which is not in my pc anymore.

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